Conservative MPs will today revolt over Europe in the latest test of David
Cameron’s authority over his own backbenchers.

The Commons will today debate the detail of the European Union Bill, which ministers say will prevent the EU gaining more power at Parliament’s expense.

The Bill was conceived as a significant concession to Conservative MPs worried that the Coalition was not fully opposed to EU integration.

It is meant to ensure that any future transfer of sovereignty to Brussels triggers a British referendum, but has failed to assuage some Conservative backbenchers

Tory critics say the Bill still leaves the final decision with ministers and so opens the way for judicial challenges that would put Britain’s relationship with the EU in the hands of judges, not Parliament.

The rebellion is being led by Bill Cash, the Conservative chairman of the Commons European Scrutiny Committee.